20003216 has 10 divisors (see below), whose sum is σ = 38756262. Its totient is φ = 10001600.

The previous prime is 20003201. The next prime is 20003227. The reversal of 20003216 is 61230002.

It can be written as a sum of positive squares in only one way, i.e., 10368400 + 9634816 = 3220^2 + 3104^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20003216.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625085 + ... + 625116.

Almost surely, 2^20003216 is an apocalyptic number.

It is an amenable number.

20003216 is a deficient number, since it is larger than the sum of its proper divisors (18753046).

20003216 is a wasteful number, since it uses less digits than its factorization.

20003216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250209 (or 1250203 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20003216 is about 4472.4955002772. The cubic root of 20003216 is about 271.4563101581.

Adding to 20003216 its reverse (61230002), we get a palindrome (81233218).

The spelling of 20003216 in words is "twenty million, three thousand, two hundred sixteen".